başarılı bilgisayar mühendisleri bakabilir mi

int main(int argc , char **argv)
{
class MyFirstClass
{
public:
int DegiskenA , DegiskenB , DegiskenC , DegiskenD;

int Toplama()
{
return DegiskenA + DegiskenB;
};

int Fark()
{
return DegiskenA - DegiskenB;
};

int Carp()
{
return DegiskenA * DegiskenB;
};

double Bol()
{
return (double)DegiskenA / (double)DegiskenB;
};
};
class SubMyFirstClass : public MyFirstClass
{
public :
int Kare()
{
return (DegiskenA * DegiskenA) + (DegiskenB * DegiskenB);
};
};

int a , b;
MyFirstClass MFC;
cout << "1.Degeri Giriniz... " << endl;
cin >> a;
MFC. DegiskenA = a;

cout << "2.Degiskeni Giriniz... " << endl;
cin >> b;
MFC. DegiskenB = b;

cout << "Toplama Islemi : " << MFC. Toplama() << endl;
cout << "CIkarma Islemi : " << MFC. Fark() << endl;
cout << "Carpma Islemi : " << MFC. Carp() << endl;
cout << "Bolme Islemi : " << MFC.Bol() << endl;

SubMyFirstClass SMFC;
SMFC. DegiskenA = a;
SMFC. DegiskenB = b;
cout << "Kareler : " << SMFC. Kare() << endl;